Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Community
Ask the community for help and clear up your study doubts
Discover the best universities in your country according to Docsity users
Free resources
Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors
A time constant of 0.5 sec: a) Low Pass Filter 15 Hz b) High Filter 35 Hz c) Low Filter 5.0 Hz d) High Pass Filter 0.3 Hz correct answers >> d) High Pass Filter 0.3 Hz Input impedance should be a) very low. b) equal to the common mode rejection ratio. c) very high. d) less than the common mode rejection ratio. correct answers >> c) very high. Which of the following most closely relates to the ratio of an amplifiers output to input signal? a) System Gain
Typology: Exams
1 / 138
This page cannot be seen from the preview
Don't miss anything!
A time constant of 0.5 sec: a) Low Pass Filter 15 Hz b) High Filter 35 Hz c) Low Filter 5.0 Hz d) High Pass Filter 0.3 Hz correct answers >> d) High Pass Filter 0.3 Hz Input impedance should be a) very low. b) equal to the common mode rejection ratio. c) very high. d) less than the common mode rejection ratio. correct answers >> c) very high.
Which of the following most closely relates to the ratio of an amplifiers output to input signal? a) System Gain b) Display sensitivity c) Impedance d) CMRR correct answers >> a) System Gain A device that alters the frequency composition of a signal: a) transducer b) capacitor c) conductor d) filter correct answers >> d) filter The waveforms contain frequencies as high as 100 hertz. What is the Nyquist sampling rate? a) 50 samples/second b) >200 samples/second c) >100 samples/second d) 25 samples/second correct answers >> b) > samples/second
A 0.5 Hz wave is enhanced without affecting a spike by using a) LF 5HZ b) LF 0.3HZ c) HF 35HZ d) LF 1HZ correct answers >> b) LF 0.3HZ Which of the following principles best applies to the EEG amplifiers? a) Sampling b) Aliasing c) Common mode rejection d) Filtering correct answers >> c) Common mode rejection Which of the following settings is most sensitive? a) 2 uV/mm b) 5 mV/cm c) 2 mV/cm d) 5 uV/mm correct answers >> a) 2 uV/mm
Which of the following converts an analog signal into a series of digital binary numbers? a) Differential Amplifier b) Fast Fourier Transform c) Impedance Meter d) A/D Converter correct answers >> d) A/D Converter Gradual changes in amplitude, frequency, or spatial distribution of rhythms is known as: a) Attenuation b) Evolution c) Asymmetry d) Background activity correct answers >> b) Evolution EEG amplifiers work on the principle(s) of a) amplification. b) differential discrimination. c) aliasing. d) both differential and amplification. correct answers >> d) both differential and amplification.
a) Differential amplifier b) Bipolar amplifier c) Referential amplifier d) Half cycle amplifier correct answers >> a) Differential amplifier Increasing the number of seconds displayed on the monitor a) increases spike duration b) does not change spike amplitude or duration c) decreases spike duration d) increases spike amplitude correct answers >> b) does not change spike amplitude or duration Which of the following is the most appropriate sampling rate that should be used for a HFF setting of 70Hz., according to Nyquist theory? a) 140 p/ sec b) 20 p/ sec c) 210 p sec d) 10 p/sec correct answers >> a) 140 p/ sec
Low sampling rate may cause fast frequencies to appear slower: a) aliasing b) low impact impedance c) overfiltering d) long time constant correct answers >> a) aliasing TIME CONSTANT a) Low frequency filter b) Gain c) Time axis d) Sensitivity correct answers >> a) Low frequency filter The sharpness of the frequency response curve is determined by the filter a) bandwidth. b) rolloff. c) capacitance. d) notch. correct answers >> b) rolloff.
High data sampling rates in a digital EEG machine create a) long EEG recordings. b) smooth, connected lines. c) low amplitude EEG activity. d) choppy, rigid lines. correct answers >> b) smooth, connected lines. 2016 ACNS Guidelines recommends a minimum horizontal resolution of: a) 8 Hz b) 8 bits c) 16 bits d) 16 Hz correct answers >> c) 16 bits What is the specification of the minimum sampling rate used, in relation to the highest frequency signal recorded? a) Coulombs law b) Paley-Winer therorem c) Ohm's theory d) Nyquist theory correct answers >> d) Nyquist theory
The 60 Hz notch filter will have the greatest effect on a waveform having a duration of a) 25 msec. b) 50 msec. c) 16 msec. d) 10 msec. correct answers >> c) 16 msec. Which of the following instruments magnifies the common- mode voltage difference between two inputs? a) Fast Fourier Transform b) Impedance Meter c) A/D Converter d) Differential Amplifier correct answers >> d) Differential Amplifier Which mathematically converts the time function into a sine wave of different frequencies? a) A/D converter b) Differential Amplifier c) Impedance Meter d) Fast Fourier Transform correct answers >> d) Fast Fourier Transform
A device that alters the frequency composition of a signal: a) filter b) capacitor c) transducer d) conductor correct answers >> a) filter UNDERSAMPLING a) Common Mode Rejection b) Impedance c) Aliasing d) Fast Fourier transform correct answers >> c) Aliasing Input impedance should be a) very high. b) less than the common mode rejection ratio. c) very low. d) equal to the common mode rejection ratio. correct answers >> a) very high.
Doubling the inter-electrode distances will have what effect on the waveforms? a) No effect b) Increase amplitude c) Decrease muscle artifact d) Increase slow activity correct answers >> b) Increase amplitude Which of the following time constants would best display delta activity? a) 0.3 second b) 0.5 second c) 1.0 second d) 0.1 second correct answers >> c) 1.0 second FREQUENCY a) influenced by sensitivity and measured in cycles per second b) influenced by CMRR and measured in microvolts c) influenced by sampling rate and measured in hertz d) influenced by impedance and measured in millimeters correct answers >> c) influenced by sampling rate and measured in hertz
Signals common to both inputs of a differential amplifier with like frequency, amplitude and phase are: a) attenuated 63% b) canceled c) attenuated 37% d) amplified correct answers >> b) canceled LONG TIME CONSTANT a) LFF of 1 Hz b) LFF of .1 Hz c) HFF of 35 Hz d) HFF of 70 Hz correct answers >> b) LFF of .1 Hz For low frequency filters (LFFs), the corresponding time constants for LFF cutoff frequency of 3 Hz would be a) 0.06 sec b) 0.03 sec c) 0.05 sec d) 0.016 sec correct answers >> c) 0.05 sec
What happens when a 60 cycle sine wave is sampled at 100 hertz? a) aliasing b) overlap of data c) subharmonic response d) digital filtering correct answers >> a) aliasing All of the following factors favor cancellation of signals in the two inputs of an amplifier, except a) equal impedances in the inputs. b) cerebral potentials in common mode. c) unequal impedances in the inputs. d) shorter inter-electrode distance. correct answers >> c) unequal impedances in the inputs. FREQUENCY RESPONSE CURVE a) Filters b) Input impedance c) Sensitivity d) Duration correct answers >> a) Filters
According to the Guidelines, how many bits of resolution is required? a) 8 b) 16 c) 10 d) 13 correct answers >> b) 16 The ability of an amplifier to reject like signals. a) sensitivity b) phase reversal c) common mode rejection d) amplifier gain correct answers >> c) common mode rejection If the Low Frequency Filter is changed from 1 Hz to 5 Hz, how will a 2 Hz slow wave be affected? a) It will be accentuated b) It will be significantly attenuated c) It will not be affected d) It will be minimally (insignificantly) attenuated correct answers >> b) It will be significantly attenuated
Digital EEG montages are reformatted by using correct answers >> system reference Of the following, which is NOT an ACNS guideline for ECI recording? a) Record at the standard sensitivity setting of 7 V/mm for at least 30 minutes of the recording. b) High frequency filters should not be set below 30 Hz, and low frequency filters should not be set above 1 Hz. c) Montages used should include electrode pairs that are at least 10 cm apart. d) The integrity of the entire system should be tested by tapping each electrode individually. correct answers >> a) Record at the standard sensitivity setting of 7 V/mm for at least 30 minutes of the recording. Which of the following is one of the 10 ACNS Guidelines for ECI recordings? a) use of double distance montages b) utilization of eyelead monitors
